﻿/*
* Copyright (c) 2010-2012 Tesla Engine Group
* 
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* 
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* 
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/


using System;
using Tesla.Graphics.Implementation;

namespace Tesla.Graphics {
    /// <summary>
    /// Abstract class that represents a resource bound to the graphics pipeline.
    /// </summary>
    public abstract class GraphicsResource : IDisposable {
        private IRenderSystemProvider _renderSystem;

        /// <summary>
        /// Get or sets the name of this resource.
        /// </summary>
        public String Name {
            get {
                return this.Implementation.Name;
            }
            set {
                this.Implementation.Name = value;
            }
        }

        /// <summary>
        /// Gets or sets the ResourceID of this resource. Can only be set once, usually by the renderer.
        /// </summary>
        public long ResourceID {
            get {
                return this.Implementation.ResourceID;
            }
            set {
                this.Implementation.ResourceID = value;
            }
        }

        /// <summary>
        /// Gets if the resource's implementation has been disposed.
        /// </summary>
        public bool IsDisposed {
            get {
                return this.Implementation.IsDisposed;
            }
        }

        /// <summary>
        /// Gets or protected sets the render system that created this resource.
        /// </summary>
        public IRenderSystemProvider RenderSystem {
            get {
                return _renderSystem;
            }
            protected set {
                _renderSystem = value;
            }
        }

        /// <summary>
        /// Gets the API-specific implementation of this resource.
        /// </summary>
        public abstract GraphicsResourceImplementation Implementation {
            get;
        }


        /// <summary>
        /// Creates a new instance of <see cref="GraphicsResource"/>.
        /// </summary>
        protected GraphicsResource() {}

        /// <summary>
        /// Resource finalizer
        /// </summary>
        ~GraphicsResource() {
            Dispose(false);
        }

        /// <summary>
        /// Dispose the resource.
        /// </summary>
        public void Dispose() {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        /// <summary>
        /// Releases unmanaged and - optionally - managed resources
        /// </summary>
        /// <param name="disposing"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
        protected virtual void Dispose(bool disposing) {
            GraphicsResourceImplementation impl = this.Implementation;
            if(impl != null) {
                if(!impl.IsDisposed && disposing) {
                    impl.Dispose();
                }
            }
        }
    }
}
